Mold for sewers.



PATBNTED JULY 23, 1907.

GfGEORGENSON.

MOLD FOR SEWBRS.

ArrLIcATIoN FILED Dnc. '1. 190s.

2 SHEETS-SHEET 1.

/NvENrofr GEDRGE GBDHGENSUN W/TNESSES Arrow/sysv l GEORGE GEORGENSON, OF WILMINGTON, NORTH CAROLINA.

MOLD FOR SEWERS.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed December 7, 1906. Serial No. 346,701.

To all 'whom it may concern:

Be it known that I, GEORGE GEoRGENsoN, a citizen of the United States, and a resident of Wilmington, in the county of New Hanover and State oi North Carolina, have invented an Improved Mold for Sewers, dac., of which the following is a specification.

My invention is 4an improvement in expansible molds for use in forming sewers or conduits oi various kinds.

The details of construction, arrangement, and combination oi parts are as hereinafter described, and illustrated in the accompanying drawings, in which (Sheet) Figure l is an end view of my improved mold when in cylindrical form. Fig. 2 is a longitudinal section on the line 2 2 of Fig. 1. Fig` 3 is an enlarged cross-section of a portion of the mold. Fig. 4 is a longitudinal section o a portion o the mold. (Sheet 2) Fig. 5 is an end view oi the mold when adjusted in oval or egg shape form. Fig. 6 is a longitu-r dinal section of a portion of the mold on the lineG-G oi Fig. 5. Fig. 7 is a transverse section oi a portion oi the mold on the line 7-7 of Fig. 5.

l indicates the shell or body of the mold which is formed o flexible sheet metal, the side edges o the same being overlapped. The said shell or body l is provided interiorly with braces or struts 2, the same consisting oi bars whosel outer ends are attached to the shell at opposite points, and their, inner ends are overlapped and slotted longitudinally to receive the iastening screw-bolt 3. .These struts or braces 2 serve to hold the mold distended to any required size or any required form for which it is adapted. Lprovide an improved means for adjusting the shell l, that is to say, for expanding or contracting it, as occasion requires. A shaft 4 is arranged adjacent to the inner edge 5 ofthe shell l, the same extending longitudinally of the shell, but spaced therefrom, and supported rotatably in brackets 6, which are suitably secured to the shell by means of screw-bolts, as shown in Fig. 3. Upon this shait are keyed two toothed wheels 7, 7, and the same engage racks 8 and 8a, which are secured to the inner overlapping face o the shell. The racks are formed of thin strips or bars of flexible metal and may be secured to the shell by screws, or brazing, or by any other suitable means. The edges of these strips 8, Stare rabbeted to receive the flanges or claws o blocks 9 secured to the outer face of the inner portion of the shell. Thus the overlapping portions of the shell are held together and practically parallel, but are adapted to slide on each other.

The wheels 7, 7, are made oi such diameter that they project through slots formed in the inner overlapped 'portion of the shell and project into engagement with the racks. It is obvious that if these wheels 7--7fL be rotated in one direction or the other, the shell will be contracted or expanded correspondingly, and, since both wheels are iast on the shaft 4, it is equally apparent that both will rotate together so that the shell will be contracted or expanded uniformly throughout its length. The means for rotating the wheels and the shaft consist-oi a hand lever 10 which is pivoted on the shaft and provided with a device l1 adapted to engage the teeth oi the adjacent wheel 7. Said device consists of a bar which is secured to the lever l() and adapted to slide thereon, it having longitudinal slots that receive studs or bolts l2 that enter the lever. The inner enlarged end or head of the locking device 1l is recessed to adapt it to engage the teeth of the wheel 7. For adjusting the locking device into or out oi engagement with the wheel 7, I employ an elbow lever 13, which is pivoted to the lever 10 and provided with a slot in its shorter arm which receives a stud that secures it to the locking device 11. It will now be seen that, ii the lever be thrown over to the position indicated in Fig. 3, that is, to the right, the wheel 7 will be rotated in a direction indicated by the arrow applied thereto, and thus the inner overlapped edge o the shell will be slid on the outer portion and the shell contracted in size or diameter. On the other hand, if the lever be thrown from right to left, it is apparent that the opposite result will occur, namely, the shell will be expanded. The manipulation of the locking device 11 is easily effected, or in other words it may be easily and quickly engaged with, or disengaged from, a tooth on the wheel 7.

In Fig. 5, the shell 1 is shown adjusted to form in cross-section an oval or egg-shape ligure, which is the form required for some sewers or other forms of conduits. It is apparent that this form is produced by contracting one set, say the lower set, of braces 2 more than the other, say the upper ones. This adjustment is ordinarily effected in the first instance, and then the lever 10 is operated to rotate the wheels 7, 7, and thereby adjust the overlapped ends oi the shell on each other as required. In other words, the braces are rst set to give the proper size, and form to the mold, whether cylindrical or oval, and then the lever and cog wheels are operated to draw the overlapping portions oi the shell one way or the other, in order to fix the shell rigidly in the desired form. The adjustment for difierent forms and sizes may be easily and quickly effected, and the overlapped portions may be quickly adjusted and locked. The mold is also light and may be easily transported from place to place according to the re quirements oi the work to be done.

I claim- 1. A mold for the purpose specified comprising a flexible sheet metal shell or body formed in one piece and having overlapping side edges, interior braces attached to the shell at diametrically opposite points and overlapping at their inner ends which are slotted longitudinally, clamping bolts passing through the coincident slots of the braces, and means for adjustingr the overlapping edges of the shell upon each other, the same comprising a rotatable shaft extending longitudinally of the shell and having supports attached to the inner or overlapped edges of the same, the shaft being arranged Within the shell toothed wheels keyed on said shaft, racks attached to the outer or overlapping portions of the shell, devices secured to the inner edge of the shell and engaging the said racks, a lever pivoted on the shaft and having a device adapted for engagement With the teeth of the adjacent wheel, and an attachment of lche lever for manipulating said locking device, substantially as set forth.

2. A mold for the purpose specified comprising a flexible sheet metal shell or body, interior braces consisting of bars Whose inner ends are overlapped and provided with coincident slots, clamping bolts passing through `said slots and serving to secure the braces to each other in any adjustment, racks secured to the overlapping portion of the shell, toothed wheels engaging the racks, and journaled on the inner or overlapped portion, a rotatable shaft upon which the wheels are mounted and arranged within the shell, and means for rotating said shaft and Wheels for effecting contraction or expansion of the shell, substantially as described.

3. The improved mold consisting of a flexible sheet metal shell, or body, interior braces 2 attached at one end the said slots and serving to secure the bars together in l any adjustment, substantially as described.

GEORGE GEoRGENsoN Witnesses R. I-I. NoR'rHRoP, D. A. MARINE. 

